PIC Microcontoller Math Method

Multiply 16x8 bit from Martin Sturm

Code:

Martin Sturm shares this code:

; 16bit by 8bit unsigned multiply
;  by Martin Sturm 2010
; tested over all input combinations
;
; Nothing special, just a modified version of 16x16 code on piclist.com
;
; if t is a temp
;  W * bH:bL -> r3:r2:r1
; 19 cycles, 85-125, 105 average
;
; else, comment out MOVWF t
;  t * bH:bL -> r3:r2:r1   (t is modified)
; 18 cycles, 84-124, 104 average
;
MULT_16x8_SMALL MACRO bH,bL, t, r3,r2,r1
 LOCAL m1, m2

	CLRF	r3
	CLRF	r2
	CLRF	r1
	MOVWF	t		; optionally comment out
	BSF	r1,7
m1:
	RRF	t,F
	SKPC
	 GOTO	m2
	MOVFW	bL
	ADDWF	r2,F
	MOVFW	bH
	SKPNC
	 INCFSZ	bH,W
	  ADDWF	r3,F
m2:
	RRF	r3,F
	RRF	r2,F
	RRF	r1,F
	SKPC
	 GOTO	m1
	ENDM

file: /Techref/microchip/math/mul/m16x8mds2.htm, 1KB, , updated: 2010/4/12 20:53, local time: 2024/11/22 04:02, owner: MDS-gmail-IE8,

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